1 /* $NetBSD: t_rwtoro.c,v 1.1 2017/01/27 10:45:11 hannken Exp $ */
2
3 /*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/types.h>
30 #include <sys/mount.h>
31 #include <sys/stat.h>
32 #include <sys/statvfs.h>
33
34 #include <atf-c.h>
35 #include <fcntl.h>
36 #include <libgen.h>
37 #include <stdlib.h>
38 #include <unistd.h>
39
40 #include <rump/rump_syscalls.h>
41 #include <rump/rump.h>
42
43 #include <miscfs/nullfs/null.h>
44 #include <fs/tmpfs/tmpfs_args.h>
45
46 #include "../common/h_fsmacros.h"
47 #include "../../h_macros.h"
48
49 static const char *unsupported = "fs does not support r/o remount";
50 static char file_path[MAXPATHLEN];
51 static int file_fd;
52
53 /*
54 * Remount the filesystem read-only and test errno.
55 * Skip filesystems that don't implement read-write -> read-only.
56 */
57 static void
remount_ro(const atf_tc_t * tc,const char * mp,int expected_errno)58 remount_ro(const atf_tc_t *tc, const char *mp, int expected_errno)
59 {
60 int error;
61 union {
62 struct tmpfs_args tmpfs;
63 char data[4095];
64 } mount_args;
65 int mount_args_length;
66 struct statvfs sbuf;
67
68 if (FSTYPE_ZFS(tc))
69 atf_tc_skip("%s", unsupported);
70
71 /* Prepare mount arguments. */
72 RL(rump_sys_statvfs1(mp, &sbuf, ST_WAIT));
73 mount_args_length = sizeof(mount_args);
74 memset(&mount_args, 0, mount_args_length);
75 if (FSTYPE_TMPFS(tc))
76 mount_args.tmpfs.ta_version = TMPFS_ARGS_VERSION;
77 mount_args_length = rump_sys_mount(sbuf.f_fstypename, mp, MNT_GETARGS,
78 &mount_args, mount_args_length);
79 ATF_CHECK(mount_args_length >= 0);
80
81 /* Remount and test result. */
82 error = rump_sys_mount(sbuf.f_fstypename, mp, MNT_UPDATE | MNT_RDONLY,
83 &mount_args, mount_args_length);
84 if (errno == EOPNOTSUPP)
85 atf_tc_skip("%s", unsupported);
86 if (expected_errno == 0)
87 ATF_CHECK(error == 0);
88 else
89 ATF_CHECK_ERRNO(expected_errno, error == -1);
90 }
91
92 static void
open_file_ro(const char * prefix)93 open_file_ro(const char *prefix)
94 {
95
96 snprintf(file_path, sizeof(file_path), "%s/file", prefix);
97 RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
98 RL(rump_sys_close(file_fd));
99 RL(file_fd = rump_sys_open(file_path, O_RDONLY));
100 }
101
102 static void
open_file_ro_unlink(const char * prefix)103 open_file_ro_unlink(const char *prefix)
104 {
105
106 snprintf(file_path, sizeof(file_path), "%s/file", prefix);
107 RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
108 RL(rump_sys_close(file_fd));
109 RL(file_fd = rump_sys_open(file_path, O_RDONLY));
110 RL(rump_sys_unlink(file_path));
111 }
112
113 static void
open_file_rw(const char * prefix)114 open_file_rw(const char *prefix)
115 {
116
117 snprintf(file_path, sizeof(file_path), "%s/file", prefix);
118 RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
119 }
120
121 static void
close_file(const char * unused)122 close_file(const char *unused)
123 {
124
125 RL(rump_sys_close(file_fd));
126 }
127
128 static void
basic_test(const atf_tc_t * tc,const char * mp,int expected_errno,bool use_layer,void (* pre)(const char *),void (* post)(const char *))129 basic_test(const atf_tc_t *tc, const char *mp, int expected_errno,
130 bool use_layer, void (*pre)(const char *), void (*post)(const char *))
131 {
132 const char *null_mount = "/nullm";
133 struct null_args nargs;
134
135 if (use_layer) {
136 RL(rump_sys_mkdir(null_mount, 0777));
137 memset(&nargs, 0, sizeof(nargs));
138 nargs.nulla_target = __UNCONST(mp);;
139 RL(rump_sys_mount(MOUNT_NULL, null_mount, 0,
140 &nargs, sizeof(nargs)));
141 }
142 if (pre)
143 (*pre)(use_layer ? null_mount : mp);
144 remount_ro(tc, mp, expected_errno);
145 if (post)
146 (*post)(use_layer ? null_mount : mp);
147 if (use_layer)
148 RL(rump_sys_unmount(null_mount, 0));
149 }
150
151 static void
noneopen(const atf_tc_t * tc,const char * mp)152 noneopen(const atf_tc_t *tc, const char *mp)
153 {
154
155 basic_test(tc, mp, 0, false, NULL, NULL);
156 }
157
158 static void
readopen(const atf_tc_t * tc,const char * mp)159 readopen(const atf_tc_t *tc, const char *mp)
160 {
161
162 basic_test(tc, mp, 0, false, open_file_ro, close_file);
163 }
164
165 static void
writeopen(const atf_tc_t * tc,const char * mp)166 writeopen(const atf_tc_t *tc, const char *mp)
167 {
168
169 basic_test(tc, mp, EBUSY, false, open_file_rw, close_file);
170 }
171
172 static void
read_unlinked(const atf_tc_t * tc,const char * mp)173 read_unlinked(const atf_tc_t *tc, const char *mp)
174 {
175
176 basic_test(tc, mp, EBUSY, false, open_file_ro_unlink, close_file);
177 }
178
179 static void
layer_noneopen(const atf_tc_t * tc,const char * mp)180 layer_noneopen(const atf_tc_t *tc, const char *mp)
181 {
182
183 basic_test(tc, mp, 0, true, NULL, NULL);
184 }
185
186 static void
layer_readopen(const atf_tc_t * tc,const char * mp)187 layer_readopen(const atf_tc_t *tc, const char *mp)
188 {
189
190 basic_test(tc, mp, 0, true, open_file_ro, close_file);
191 }
192
193 static void
layer_writeopen(const atf_tc_t * tc,const char * mp)194 layer_writeopen(const atf_tc_t *tc, const char *mp)
195 {
196
197 basic_test(tc, mp, EBUSY, true, open_file_rw, close_file);
198 }
199
200 static void
layer_read_unlinked(const atf_tc_t * tc,const char * mp)201 layer_read_unlinked(const atf_tc_t *tc, const char *mp)
202 {
203
204 basic_test(tc, mp, EBUSY, true, open_file_ro_unlink, close_file);
205 }
206
207 ATF_TC_FSAPPLY(noneopen, "remount r/o with no file open");
208 ATF_TC_FSAPPLY(readopen, "remount r/o with file open for reading");
209 ATF_TC_FSAPPLY(writeopen, "remount r/o with file open for writing");
210 ATF_TC_FSAPPLY(read_unlinked,
211 "remount r/o with unlinked file open for reading");
212 ATF_TC_FSAPPLY(layer_noneopen, "remount r/o with no file open on layer");
213 ATF_TC_FSAPPLY(layer_readopen,
214 "remount r/o with file open for reading on layer");
215 ATF_TC_FSAPPLY(layer_writeopen,
216 "remount r/o with file open for writing on layer");
217 ATF_TC_FSAPPLY(layer_read_unlinked,
218 "remount r/o with unlinked file open for reading on layer");
219
ATF_TP_ADD_TCS(tp)220 ATF_TP_ADD_TCS(tp)
221 {
222
223 ATF_TP_FSAPPLY(noneopen);
224 ATF_TP_FSAPPLY(readopen);
225 ATF_TP_FSAPPLY(writeopen);
226 ATF_TP_FSAPPLY(read_unlinked);
227 ATF_TP_FSAPPLY(layer_noneopen);
228 ATF_TP_FSAPPLY(layer_readopen);
229 ATF_TP_FSAPPLY(layer_writeopen);
230 ATF_TP_FSAPPLY(layer_read_unlinked);
231
232 return atf_no_error();
233 }
234